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• W2051805350 abstract "We investigate impact of π0-production data at Relativistic Heavy Ion Collider (RHIC) and future E07-011 experiment for the structure function g1 of the deuteron at the Thomas Jefferson National Accelerator Facility (JLab) on studies of nucleonic spin structure, especially on the polarized gluon distribution function. By global analyses of polarized lepton–nucleon scattering and the π0-production data, polarized parton distribution functions are determined and their uncertainties are estimated by the Hessian method. Two types of the gluon distribution function are investigated. One is a positive distribution and the other is a node-type distribution which changes sign at x∼0.1. Although the RHIC π0 data seem to favor the node type for Δg(x), it is difficult to determine a precise functional form from the current data. However, it is interesting to find that the gluon distribution Δg(x) is positive at large x (>0.2) due to constraints from the scaling violation in g1 and RHIC π0 data. The JLab-E07-011 measurements for g1d should be also able to reduce the gluon uncertainty, and the reduction is comparable to the one by RUN-5 π0-production data at RHIC. The reduction is caused mainly by the error correlation between polarized antiquark and gluon distributions and by a next-to-leading-order (NLO) gluonic effect in the structure function g1d. We find that the JLab-E07-011 data are accurate enough to probe the NLO gluonic term in g1. Both RHIC and JLab data contribute to better determination of the polarized gluon distribution in addition to improvement on polarized quark and antiquark distributions." @default.
• W2051805350 created "2016-06-24" @default.
• W2051805350 creator A5007376623 @default.
• W2051805350 creator A5050917135 @default.
• W2051805350 date "2009-05-01" @default.
• W2051805350 modified "2023-09-30" @default.
• W2051805350 title "Determination of gluon polarization from deep inelastic scattering and collider data" @default.
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• W2051805350 doi "https://doi.org/10.1016/j.nuclphysb.2008.12.026" @default.
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